Go in your closet. Find your sweatpants, yoga pants, any comfy pants. Put them on, take off all your makeup, put your hair up. Go to your kitchen and make yourself your favorite dinner/lunch/breakfast, pick up your favorite book.

Enjoy yourself, enjoy the comfortable pants, the idea that right then and there you are the perfect you. 

There is no one else who compares to you. Your skin, your smile, the size of your hips, the curve of your neck. You are 100% you. 

Once you realize that comparing yourself to others fades away. You begin to appreciate your body and how comfortable you are with it.

Then, the next time you have work, or school or any sort of errand to run, dress in a quirky, fun or original outfit. Decorate what you have so it shows off your personality. Be yourself. 

I hope this helps. These are the things I do when I feel a little less than perfect.